Under a weak integrability condition, \(F\)  in Equation (REF ) may be “well” approximated by a piecewise constant function \(F_{\text{est}}\)  (see, e.g., [1]}). The estimation techniques below are borrowed
from [2]}, [3]}, [4]}.They were often used in practice for parameter identification (see, e.g., [5]}). Let us summarize two types of computations:
